跳到主要內容

臺灣博碩士論文加值系統

(34.226.244.254) 您好!臺灣時間:2021/08/03 02:34
字體大小: 字級放大   字級縮小   預設字形  
回查詢結果 :::

詳目顯示

我願授權國圖
: 
twitterline
研究生:華文聖
研究生(外文):Wen-Sheng Hua
論文名稱:使用傳輸參考信號於超寬頻系統之通道估測與等化
論文名稱(外文):Channel Estimation and Equalization for Transmitted-Reference Ultra-Wideband Systems
指導教授:張名先
指導教授(外文):Ming-Xian Chang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:電腦與通信工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2008
畢業學年度:96
語文別:英文
論文頁數:68
中文關鍵詞:單載波頻域等化系統最大可能性群集通道估測遞迴式通道估測傳輸參考信號超寬頻系統
外文關鍵詞:transmitted-reference (TR)Ultra-wideband (UWB)maximum-likelihood clustered channel estimationrecursive channel estimationsingle-carrier frequency-domain equalization (SC
相關次數:
  • 被引用被引用:0
  • 點閱點閱:64
  • 評分評分:
  • 下載下載:0
  • 收藏至我的研究室書目清單書目收藏:0
在近年來超寬頻(UWB)系統中,傳輸參考信號(TR)廣泛受到大家的歡迎與應用。主要原因在於接收機的考量。因為它不像犁耙式接收機(Rake receiver),需要大量的閥(Tap),以及完美的時間和通道響應在接收端。因此複雜度相對的較低,也比較切實際。對於傳輸參考信號之超寬頻(TR-UWB)系統,它的優點在於通道狀態資訊能夠非常直覺地從傳輸參考信號中獲得。但是一般的傳輸參考信號之超寬頻系統,為了能夠獲取較佳的系統效能,因此傳送大量的傳輸參考信號,導致降低系統的傳輸資料率。
在本論文中,首先我們討論一般傳統的傳輸參考信號之超寬頻系統。並且,我們也提出幾種遞迴式(recursive)通道估測與最大可能性群集通道估測(ML CCE)的方法來改善傳統的傳輸參考信號之超寬頻系統的問題。另外,我們也考慮此系統在單載波(SC)傳輸系統之中。針對具有符號間干擾(ISI)的情形,利用足夠的護衛區間(GI)與在頻域上運作等化的方式,來降低系統的複雜度。最後,也更進一步的將遞迴式通道估測的方法應用在此系統之中。
Transmitted-reference (TR) signal is popularly used for ultra-wideband (UWB) systems recently. The main reason lies in the consideration in the receiver. Because it is not like Rake receiver, which needs a large amount of taps, and perfect timing and channel estimates in the receiver. Therefore, the complexity of the TR-UWB system is relative lower, and more feasible. For the ultra-wideband system with TR (TR-UWB), the receiver could readily estimate the channel state information from the TR. But for the typical TR-UWB system, we need to transmit a large number of TR signals in order to obtain better system performance, and this reduces data transmission rates of the system.
In this thesis, we first study the general TR-UWB system. Then we propose several approaches of recursive channel estimation and maximum-likelihood (ML) clustered channel estimation, such that we could obtain better performance using the same amount of TR. In addition, we consider single-carrier (SC) block transmission systems. To remove the inter-symbol interference (ISI), we use long enough guard interval (GI) and the low complexity frequency-domain equalization. Finally, we apply the method of recursive channel estimation to the SC block transmission with frequency-domain equalization.
Chinese Abstract Ⅰ
English Abstract Ⅱ
Acknowledgements Ⅲ
Contents Ⅳ
List of Figures Ⅵ
List of Tables Ⅸ

1. Introduction.......................................1
1.1 UWB systems....................................1
1.2 Single-Carrier System with Frequency-Domain Equalization..........2
1.3 Organization of this thesis....................3

2. Transmitted-Reference with UWB Systems.............4
2.1 UWB Channel Model..............................4
2.2 UWB Waveforms..................................11
2.2.1 Gaussian pulses..........................11
2.2.2 Hermite pulses...........................13
2.3 Transmitted-Reference with UWB Systems.........16
2.3.1 System Model and Signal Processing Mechanism.............16
2.3.2 Simulation Results.......................21
2.4 Recursive Channel Estimation Techniques for TR-UWB Systems...............23
2.4.1 System Model and Signal Processing Mechanism.............23
2.4.2 Simulation Results.......................29
2.5 Maximum-Likelihood Clustered Channel Estimation for TR-UWB Systems........34
2.5.1 System Model and Signal Processing Mechanism.............34
2.5.2 Simulation Results.......................37
2.6 Combine Recursive Channel Estimation with ML Clustered ChannelEstimation for TR-UWB Systems........39
2.6.1 System Model.............................39
2.6.2 Simulation Results.......................40

3. Single-Carrier Frequency-Domain Equalization for TR-UWB
Systems...............42
3.1 Single-Carrier System with Frequency-Domain Equalization for TR-UWB Systems.......................42
3.1.1 System Model and Signal Processing Mechanism.............42
3.1.2 Frequency-Domain Equalization............46
3.1.3 Channel Estimation.......................49
3.1.4 Simulation Results.......................50
3.2 Recursive Channel Estimation Techniques for TR-UWB with SC-FDE Systems......53
3.2.1 System Model and Signal Processing Mechanism.............53
3.2.2 Simulation Results.......................55
3.3 Channel Taps Selection for TR-UWB with SC-FDE Systems...............59
3.3.1 System Model and Signal Processing Mechanism.............59
3.3.2 Simulation Results.......................61
3.4 Combine Recursive Channel Estimation with Clusters ML ChannelEstimation for TR-UWB with SC-FDE Systems......63
3.4.1 System Model.............................63
3.4.2 Simulation Results.......................64

4. Conclusions........................................66

Bibliography..........................................67
[1] X. Shen, M. Guizani and R. C. Qiu, T. Le-Ngoc, Ultra-wideband wireless communications and networks. England: John Wiley & Sons Ltd, 2006.
[2] I. Oppermann, M. Hamalainen and J. Inatti, UWB Theory and Aplications. England: John Wiley & Sons Ltd, 2004.
[3] Y. Wang and X. Dong, “Frequency-domain channel estimation for SC-FDE in UWB communications,” IEEE Trans. communications, vol. 54, no. 12, pp. 2155-2163, Dec. 2006.
[4] J. T. Foerster, et al., “Channel modeling sub-committee report final,” IEEE P802.15-02/490r1-SG3a, Nov. 2002.
[5] A. F. Molisch, J. R. Foerster and M. Pendergrass, “Channel models for ultrawideband personal area networks,” IEEE Wireless Commun., vol. 10, no. 6, pp. 14-21, Dec. 2003.
[6] A. Saleh and R. Valenzuela, “A statistical model for indoor multipath propagation channels,” IEEE JSAC, vol. SAC-5, no.2, pp. 128-137, Feb. 1987.
[7] M.-G. D. Bendetto and G. Giancola, Understanding Ultra Wide Band Radio Fundamentals. New Jersey: Prentic Hall PTR 2004.
[8] M. Ghavami, L. B. Michael and R. Kohno, Ultra wideband signals and systems in communication engineering. England: John Wiley & Sons Ltd, 2004.
[9] L. Yang and G. B. Giannakis, “Optimal pilot waveform assisted modulation for ultrawideband communications,” IEEE Trans. Wireless Commun., vol. 3, no. 4, pp. 1236-1249, July 2004.
[10] Y. L. Chao and R. A. Scholtz, “Optimal and suboptimal receivers for ultra-wideband transmitted reference systems,” in Proc. IEEE Global Telecommunications Conference (Globecomm), USA, pp.759-763, Dec 2003.
[11] A. A. D’Amico and U. Mengali, “GLRT receivers for UWB systems,” IEEE Commun. Lett., vol. 9, no. 6, pp. 487-489, June 2005.
[12] T. Q. S. Quek and M. Z. Win, “Analysis of UWB transmitted-reference communication systems in dense multipath channels,” IEEE J. Sel Areas Commun., vol. 23, no. 9, pp. 1863-1874, Sept. 2005.
[13] J. D. Choi and W. E. Stark, “Performance of ultra-wideband communications with suboptimal receivers in multipath channels,” IEEE J. Sel. Areas Commun., vol. 20, no. 9, pp. 1754-1766, Dec. 2002.
[14] C. Carbonelli and U. Mitra, “Clustered channel estimation for temporal UWB returns,” in Proc. IEEE Int. Conf. Ultra-Wideband, Switzerland, pp. 158-163, Sept. 2005.
[15] Z. Wang, X. Ma and G. B. Giannakis, “OFDM or single-carrier block transmissions?,” IEEE Commun. Mag., vol. 52, no. 3, pp. 380-394, Mar. 2004.
連結至畢業學校之論文網頁點我開啟連結
註: 此連結為研究生畢業學校所提供,不一定有電子全文可供下載,若連結有誤,請點選上方之〝勘誤回報〞功能,我們會盡快修正,謝謝!
QRCODE
 
 
 
 
 
                                                                                                                                                                                                                                                                                                                                                                                                               
第一頁 上一頁 下一頁 最後一頁 top